Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: find x maths question
emsfactory

posted on 18/3/16 at 07:20 PM Reply With Quote
find x maths question

Hi all,

a chap in work is doing some maths and is stuck on this. I said I would have a look but I cannot remember how to do these. Maths was too many moons ago for me.

Anyone know how to do it or what type of problem it is so I can have a go.

Cheers,

y=((a+x)/(5-bx))

[Edited on 18/3/16 by emsfactory]

[Edited on 18/3/16 by emsfactory]

View User's Profile E-Mail User View All Posts By User U2U Member
mark chandler

posted on 18/3/16 at 07:31 PM Reply With Quote
Looks like a quadratic equation, so easy I'll let someone else do it
View User's Profile View All Posts By User U2U Member
cliftyhanger

posted on 18/3/16 at 07:44 PM Reply With Quote
y=((a+x)/(5-bx))
5y-ybx=a+x
5y-ybx-a=x
5y-a=x+ybx
5y-a=x(1+yb)
x=(5y-a)/(1+yb)

does that work? been a while (30 years...)

View User's Profile View All Posts By User U2U Member
bi22le

posted on 18/3/16 at 07:57 PM Reply With Quote
I love a bit of algebra.

A quick scribble suggests
X = (5y-a) /(yb+1)

Damn too slow! Thats how i did it as well.

[Edited on 18/3/16 by bi22le]





Track days ARE the best thing since sliced bread, until I get a supercharger that is!

Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1

Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I

View User's Profile View All Posts By User U2U Member
emsfactory

posted on 18/3/16 at 08:03 PM Reply With Quote
Yeah thats where we got too. I am thinking there is more to it though. Some formula to be applied to make it nicer.
View User's Profile E-Mail User View All Posts By User U2U Member
rash12

posted on 18/3/16 at 08:35 PM Reply With Quote
would need y a and b values to.input.if he wants a numerical value of x
View User's Profile View All Posts By User U2U Member
nero1701

posted on 18/3/16 at 09:00 PM Reply With Quote
x=(5y-a)/(1+yb)

This is as far as you can take it unless you start with derivatives

then it becomes

(d)/(dx)((a+x)/(5-b x)) = (a b+5)/(b x-5)^2

View User's Profile View All Posts By User U2U Member
jonrotheray

posted on 18/3/16 at 09:55 PM Reply With Quote
Presumably a and b are constants, x and y are variables.

You have too many unknowns to solve this equation, but:

when y = 0, x = -a
when x = 0, y= a/5

Given values for the constants a and b, you could then draw a graph of the equation - it's linear, so should be a straight line.

View User's Profile View All Posts By User U2U Member
sprouts-car

posted on 18/3/16 at 10:05 PM Reply With Quote
quote:
Originally posted by jonrotheray
Presumably a and b are constants, x and y are variables.

You have too many unknowns to solve this equation, but:

when y = 0, x = -a
when x = 0, y= a/5

Given values for the constants a and b, you could then draw a graph of the equation - it's linear, so should be a straight line.


Its not linear





Build blog

View User's Profile Visit User's Homepage View All Posts By User U2U Member
JacksAvon

posted on 18/3/16 at 10:09 PM Reply With Quote
pies are the answer,beef lamb,steak and kidney kidney,chicken..............................just pies





The sickness started in 2001 with a Robin Hood 3A, Prelit Westy,Tiger Cub, Tiger Avon, Tiger R6, 16v Mini, Sylva Fury Fireblade, Westfield Sei, Mallock Mk11, Fireblade Locost, Tiger Avon, Procomp LA Gold, Mk26 Mallock...........and now a Mk18 Mallock.....LR750, Vandiemen FX02

View User's Profile View All Posts By User U2U Member
bi22le

posted on 18/3/16 at 10:17 PM Reply With Quote
Nope thats it. You cant simplify it.





Track days ARE the best thing since sliced bread, until I get a supercharger that is!

Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1

Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.